AS5305 Datasheet, PDF (1/2 Pages) ams AG – Integrated Hall IC for Linear and Off-Axis Rotary Motion Detection

AS5305 Integrated Hall IC for linear and off-axis rotary motion detection
AS5305
Integrated Hall IC for
Linear and Off-Axis Rotary Motion Detection
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DATA SHEET
1 General Description
The AS5305 is a single-chip IC with integrated Hall
elements for measuring linear or rotary motion using multi-
pole magnetic strips or rings.
This allows the usage of the AS5305 in applications where
the Sensor IC cannot be mounted at the end of a rotating
device (e.g. at hollow shafts). Instead, the AS5305 is
mounted off-axis underneath a multi-pole magnetized ring
or strip and provides a quadrature incremental output with
40 pulses per period at speeds of up to 20m/sec.
Using, for example, a 32pole-pair magnetic ring, the
AS5305 can provide a resolution of 1280 pulses/rev, which
is equivalent to 5120 positions/rev or 12,3bit. The
maximum speed at this configuration is 9375 rpm.
The default pole pair length is 4mm (2mm north pole / 2mm
south pole). However, the chip accepts a wide range of
multi-pole magnetic strips or rings with pole pair lengths
between 2.26 and 5.91mm and magnetic field strengths
down to 5mT. The pole pair length can be adjusted by
programming. A minimum pole pair length of 2,26mm
allows a resolution of 14,125µm per position step.
In addition to the multi-pole high-resolution track, the
AS5305 can read a second multi-pole reference track that
generates a single or multiple reference index pulse per
revolution, for absolute position identification.
The AS5305 is available in a small 20-pin TSSOP package
and specified for an operating ambient temperature of
-40° to +125°C.
2 Benefits
• Complete system-on-chip
• High reliability due to non-contact sensing
• Extended temperature range
• Suitable for the use in harsh environments
• Robust against external magnetic stray fields
3 Key Features
• High speed, up to 20m/s
• Down to 14µm resolution per position step
• User programmable pole length
• Single index pulse per revolution for absolute position
measurement using a second magnetic track
• 40 pulses per magnetic period.
• Linear movement measurement using multi-pole
magnetic strips
• Circular off-axis movement measurement using multi-
pole magnetic rings
• 4.5 to 5.5V operating voltage
• Magnetic field strength indicator
4 Applications
The AS5305 is ideal for high speed linear motion and off-
axis rotation measurement in applications such as
• electrical motors
• X-Y-stages
• rotation knobs
• industrial drives
Figure 1: Two different configurations of AS5305 with single or
double track multipole ring magnet
Revision 1.4
www.austriamicrosystems.com
Figure 2: AS5305 with magnetic multipole strip
for linear motion measurement
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